Joint for aeroplane-wings



A. H. a. FOKKER.

JOINT FOB AEROPLANE WINGS.

I APPLICATION FILED FEB. 17, I921- 1,396,176. Patented Nov. 8, 1921.

2 SHEETSSHEET l- A. H. G. FOKKER.

JOINT FOB AEROPLANE WINGS.

APPLICATION FILED FEB. 11. 1921.

1,396,176, ratenteaNowmsazl.

2 SHEETS-SHEET 2.

' to th found diflicult to do so in' the case of wooden.

JOINT m in tension and compression, another object of the invention being to efiect improvements in the means for joining the covering material of the wing in conjunction with the jointed main win beams, in order to preserve that p strength of cantaliver hich carries part of the beams.

In'the type of aeroplane supporting sur; as cantaliver or internally face known (i. e. supporting surfaces for planes in which the neceSsa provided b the structure of the planes or of I to the other parts or to the structure of the body of the aeroplane that they may be readily detached, it has been founddifijcult joint between the sald parts of suflicient strength and of sufii'ciently' low weight to be efiiciently used in anaeroplane. f plane where the mainly provided beams or other parts of'the remainmg structure.

In cases where viding the joint the actual means of consists of metal parts bove' mentioned beams,

roxed ams, owing to the high tensile and comis subjected in flight and in lan In thepresent invention the tota tenslon and compresion.

relates to improvements fication.

- ed in accordance solely by I strength is d tlons 5 of suitable length to construct the 3 to correspon mg-ends of h .Reslhent washers 14.which morn-newness, Specification of s." Patent; Application filed February 17, 1921.

Serial No. 445,732.

of wood and larged and friction adds In the accompanying drawings Figure 1 is a detail elevation of an aeroplane am joint constructed and arranged in accordance with this Fig. 1% 1s a similar Fig. '2 is a longitudinal sectional view of an aeroplane wing am with anoth 1g. 3 is a plan of a'portion ofan aeroplane wing provided with beam joints and view, showing a modijoint constructer modification.

' Patented N0v.8,1921.

covering joints in accordance with my invention.

Fig. 4 is a vertical view of the same.

Fig. 5 is a ,detail plan of the covering joint.

transverse sectional Fig. 6 i a detail sectional view of the same.

. Fig. 7 is a cation.

invention shown Flg. 1, the couplin evice 1, which is made of metal, and whic connects the opposing ends of a longitudinal aeroplane wing am or beams 2, comprises a pair of members 3 ,4, each of which is provided with a series of spaced laminas own as-of unequal length. .The member has a recess 6 and the member 4 has a 7 which fits in said pin or bolt 8 is inserted in alined openings in said projection and in the shoulders 9 'so that the'sa'rd members he aminations 5 and ence the said amsare provlded with woo en laminatlons 11 which are arranged extend transversely through th I 10, 11 and securely clamp the same together.

may be spring washers or made of any suitable elastic substance, are fitted between the heads and nuts of the bolts order to keep pressure on the the event that the wooden lamigations should similar view showing a modifi-.

and the outer laminations 10, in laminations in Referring particularly to the form of the? and which are here e laminations lamination as indicated outer ends of which are said hin e.plates time light, and is capa are connected b joints ing where they -bers 18- through j or draw wires 19 are passe slightly shrink. Glue or other suitable .ad-. hesive substance may be at 15 in Fig. 1, and the laminations may have surfaces roughened or corrugated as indicated at 1,6 in Fig. 1%

In Fig. 2 I show a modification in the construction of the aeroplane beam joint 1n P beam members 2 are narrowed toward their ends and provided with correspondingly.angularly arranged wooden laminations 1T which are correspondingly narrowed toward their outer ends.

which the wooden The metal coupling device-in this form of the invention comprlses plates orlaminations 5 fwhich are arranged in the slots 13*, are secured in place by bolts 12*, and the arranged alternately and in overlapping relation andare secured to ether by a coupling bolt 8. 1

t will be understood from the foregoing t at my improved aeroplane wing beam joint is exceedingly strong and at the same le of sustaining or enduring successfully all the compression or tensilestresses to which it may be subjected either duringflight or in landing. In further accordance with myinvention in the case of a, wing constructionin which it is desired tovconnect not only the beam .ends but also the covering material 17 of the the ends of the beams of the types herein-- before describe and the edges of the coverabut at the wing joints are form integral hinge memwhich hinge ins, or pintles as indicated twoparts of the wing,

so shaped as to in Fig 3.

In igs. 5 and 6 I tion in which hinge plates 20 are employed instead of the integral hinge members 18, being secured to mg 17 y rivets 21, and being connected together y. detachable hingepins, pintles or draw wires 22.

. Such covering joints in connection with the jointed main wing liver wing whichis provided by the wood or metal covering material sometimes used placed between the their opposing show aslight inodificathe coverm beams efiect'ually pre serve that part of the strength of the cantawould be otherwise taken solely beams.

by the While I have herein shown and described the preferred embodiments ofmy invention, I would have it understood that changes may I be made in the form, proportion and construction of the several parts without de-..

arting from the spirit of my invention and within the scope of the appended claims. What I claim is 1 1. In an aeroplane wing, beam members arrangedwith their ends spaced apart and provide with longitudinal spaced slots forming laminations a coupling device between the ends of the beam members and having spaced laminations'arranged in the slots thereof. 7

2. In an aeroplane wing, beam members arranged with their ends spaced apart, and a coupling device securing said ends to-' between said slots, and

gether, said beam members and cpupling device having laminations arranged in mutual contact and alternate relation.

"3. In an aeroplane wing, wooden beam members arranged with their ends spaced apart," and a coupling device securing sai ends together, said beam members and a metallic coupling device havinglaminations arranged relation.

4. In an aeroplane'wing, beam members arranged with their ends spaced apart and provided with longitudinal spacedslots forming laminations between said slots, and a coupling the beam members and having spaced laminations arranged in the slots thereof, said coupling devlce comprising detachable mem- V bers.

5. An aeroplane wing com rising detach; able sectionseach including am members and a covering, coupling devices between the ends of said beam members,-and detachin mutual contact and alternate g device between the ends of able hinge connections between the meeting edges of the coverings.

in presenceo two witnesses.-

ANTHONY niznmu cram roxxm.

Witnesses-z ROBERT C. Moonnr,

F Cumin.

testimon where'ofI ailix my signature I 

